Azimuthally Polarized Radial Emission from a Quantum Dot Fiber Laser

• Main Authors: Zhang, Nan, Liu, He, Stolyarov, Alexander M., Zhang, Ting, Li, Kaiwei, Shum, Perry Ping, Fink, Yoel, Sun, Xiao Wei, Wei, Lei
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2017
• Subjects: Quantum dots; Fiber laser
• Online Access: https://hdl.handle.net/10356/81402; http://hdl.handle.net/10220/43457
• Institution: Nanyang Technological University

We demonstrate an azimuthally polarized radial emission with zero angular momentum from a CdSe/CdZnS/ZnS quantum dot (QD) fiber laser. This fiber laser is realized by axially pumping the QD-doped gain plug infiltrated in the hollow cavity of a multilayer photonic band-gap fiber. The cylindrically symmetric radial emission is registered as a perfect ring-shaped pattern in the far field. The lasing threshold is measured to be ∼238 μJ/pulse, and the quality factor is calculated to be ∼4000. The unique radial emission from the resulting QD fiber laser offers a fundamental solution for the development of omnidirectional displays and light sources for biomedical analysis and phototherapy with minimal invasion.